KNOWN INFO POSSIBLE PROBLEMS DIAGNOSTIC FLOWCHART TEST OPTIONS REASON FOR QUESTION TEST OPTIONS REASON FOR QUESTION TEST OPTIONS REASON FOR QUESTION NO YES NO YES NO YES PROTECTIVE CONTROL BOX/DISTRIBUTION BOX 2-234           Change 1 BATTERIES OK LEAD 57B GROUND OK PARKING BRAKE SWITCH BAD BODY HARNESS WIRES BAD GLOWPLUG CONTROLLER   BAD ALTERNATOR BAD HARNESS WIRE 2A BAD IGNITION SWITCH BAD HARNESS WIRE 29A BAD HARNESS WIRE 29C BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD FROM 9, Page 2-232 GO TO 13, Page 2-236 ARE LEDs 2, 3, AND 4 “ON”? REPLACE PROTECTIVE CONTROL BOX/DISTRIBUTION BOX 10 11 12 VISUAL If those LEDs are not ON, that would indicate a protective control box (PCB)/distribution box malfunction. VISUAL If these LEDs are not ON that would indicate a bad connection to ground. IS LED 7 “ON”? REPAIR GROUND BODY HARNESS WIRE 57B WITH THE IGNITION SWITCH IN “RUN”  (ENGINE NOT RUNNING) POSITION, ARE ANY LEDs “ON”? (REFER TO TABLE AT RIGHT) GO TO 1, Page 2-252 1.TRY IT 2.VISUAL If no LEDs are ON, that would indicate malfunctioning batteries. TM 9-2320-280-20-1 KNOWN INFO POSSIBLE PROBLEMS BATTERIES OK LEAD 57B GROUND OK PARKING BRAKE SWITCH BAD BODY HARNESS WIRES BAD GLOWPLUG CONTROLLER   BAD ALTERNATOR BAD HARNESS WIRE 2A BAD IGNITION SWITCH BAD HARNESS WIRE 29A BAD HARNESS WIRE 29C BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD KNOWN INFO POSSIBLE PROBLEMS BATTERIES OK LEAD 57B GROUND OK PARKING BRAKE SWITCH BAD BODY HARNESS WIRES BAD GLOWPLUG CONTROLLER   BAD ALTERNATOR BAD HARNESS WIRE 2A BAD IGNITION SWITCH BAD HARNESS WIRE 29A BAD HARNESS WIRE 29C BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD